CN111788029B

CN111788029B - Portable cutting machine

Info

Publication number: CN111788029B
Application number: CN201980015372.2A
Authority: CN
Inventors: 中嶋辰夫; 能势健司; 木村卓示
Original assignee: Makita Corp
Current assignee: Makita Corp
Priority date: 2018-02-27
Filing date: 2019-02-19
Publication date: 2023-05-30
Anticipated expiration: 2039-02-19
Also published as: JP6878334B2; JP2019147220A; DE112019000424T5; WO2019167716A1; US20210001418A1; CN111788029A; US11684985B2

Abstract

Convenience can be enhanced for the operator by attaching a suspension member such as a tether belt or the like. In the present invention, when the connection portion for connecting the suspension is damaged, for example, the function of the suspension is reliably performed by clearly informing the user. The annular notification member (43) is incorporated into a connection portion (40) for connecting the suspension member (41). The hanging piece (41) is inserted into both of the connection hole in the connection portion (40) and the notification piece (43) to be connected. When the end portion (23 c) of the handle portion (23) is broken due to long-term use, the notification member (43) is pulled out to notify of the damage of the connecting portion (40).

Description

Portable cutting machine

Technical Field

The present invention relates to a portable cutting machine for performing a cutting process while an operator holds and moves it.

Background

Japanese laid-open patent publication No. 2006-326753 and japanese laid-open patent publication No. 2015-178154 disclose techniques of this type of portable cutting machine provided with hooks to be hooked to separate components. The cutting machine can be suspended by hooking the suspension part of this hook or the like to, for example, a scaffold or a handrail or the like in a work place.

Disclosure of Invention

Technical problem

However, the hooks may be easily hung on a horizontally extending double-ended support beam type pole, and there is still room for improvement when the hooks are to be hung on an upwardly extending cantilever beam type pole. Instead, conventionally, a suspension member such as a tether belt or the like has been attached to the cutter so as to be suspended.

Conventionally, the connection portion of the suspension may be damaged due to long-term use or the like. As a result, the suspension function may not be sufficiently performed. In this case, no sufficient measures are taken to prevent an operator unaware of this event from using the suspension.

The present invention relates generally to a portable cutting machine, and has an object to notify an operator to ensure execution of an original function of a suspension when a connection portion for connecting the suspension functioning as a drop prevention is damaged.

Means for solving the problems

The above problems can be solved by each of the following inventions. The first invention is a portable cutting machine configured to perform a cutting process by allowing a rotary cutting tool to cut into a cut material, the rotary cutting tool being rotated by a motor as a driving source. According to a first invention, a portable cutter includes a suspension portion to be suspended from a separate assembly. According to the first invention, the suspension portion is configured to have a suspension, a connection portion to which the suspension is connected, and a notification member configured to notify that the connection portion is deformed by an external force.

According to the first invention, when the connection portion is deformed due to damage or the like, an event of an operator or a user is notified by the notification member. The operator can thus realize that if the operator keeps the suspension in use as usual, proper functionality cannot be reliably performed. Therefore, after it repairs the damage of the connection portion, the anti-drop function can be reliably performed to allow the operator to continuously use the hanging portion.

The second invention is the portable cutter of the first invention including a handle portion extending in a forward/rearward direction along the rotary cutting tool and a hanging portion behind the handle portion.

According to the second invention, the hanging portion does not interfere with the user when the handle portion is held, so even if the hanging piece exists, the deterioration of operability can be prevented.

A third invention is the portable cutting machine according to the first or second invention, further, one or both of the connecting portion and the notification member further includes a connecting hole into which the suspension member is inserted.

According to the third invention, the suspension member is inserted into the connection hole in one or both of the connection portion and the notification member, whereby the suspension member is engaged with the connection portion or the notification member.

A fourth invention is the portable cutting machine according to the third invention, further, the hanging piece is inserted through the inner peripheral side of the notification piece and the connection hole so as to be connected to the connection portion.

According to the fourth invention, the hanging piece is inserted into the inner peripheral side (the connection hole) of the notification piece and surrounds the outer periphery of the connection piece so as to be connected to the connection portion.

A fifth invention is the portable cutting machine according to the third or fourth invention, further comprising a loop wire serving as a notification member.

According to the fifth invention, the hanging piece is inserted through the inner peripheral side of the notification piece (loop wire) so as to be connected to the connecting portion.

A sixth invention is the portable cutting machine according to the third or fourth invention, further comprising a U-shaped connecting hole as a connecting hole along the periphery of the connecting portion. The suspension member is inserted through the connection hole so as to be connected to the connection portion.

According to the sixth invention, the suspension is inserted into the connection hole of the connection portion and connected to the connection portion.

A seventh invention is the portable cutting machine according to any one of the first to sixth inventions, further comprising, when the connecting portion is deformed by an external force, a notification member being pulled up and moved by the hanging member to notify the deformation of the connecting portion.

According to the seventh invention, when the connection portion is deformed due to damage or the like, the notification member hooked by the suspension member moves to notify the user of the deformation at the connection portion or the like. The user or the like can visually observe the change in the position of the notification member to confirm that the hanging portion has been damaged or the like. By suspending the use of the damaged suspension portion, it is possible to avoid a state in which the original function of the suspension portion cannot be sufficiently performed.

Drawings

Fig. 1 is a right side view of a portable cutter according to a first embodiment.

Fig. 2 is a front view of the portable cutter according to the first embodiment, as seen from the direction indicated by arrow (II) of fig. 1.

Fig. 3 is a top view of the portable cutter according to the first embodiment, as seen from the direction indicated by arrow (III) of fig. 1.

Fig. 4 is a left side view of the portable cutter according to the first embodiment, as seen from the direction indicated by arrow (IV) of fig. 2.

Fig. 5 is a left side view of the portable cutter according to the first embodiment. The figure shows the hook in a position of use.

Fig. 6 is a left side view of the portable cutter according to the first embodiment. The figure shows a state in which the left handle case of the left and right half structures is removed.

Fig. 7 is a cross-sectional view of the portable cutter according to the first embodiment taken along the line (VII) - (VII) in fig. 6.

Fig. 8 is a cross-sectional view of the portable cutter according to the first embodiment taken along the (VIII) - (VIII) line in fig. 6.

Fig. 9 is a left side view of the handle portion. The figure shows a state in which the left handle case of the left and right half structures is removed. The figure shows a normal state in which the connection portion of the suspension portion is not damaged.

Fig. 10 is a left side view of the handle portion. The figure shows a state in which the left handle case of the left and right half structures is removed. The figure shows a state in which the connection portion of the suspension portion is damaged and the notification member has been moved.

Fig. 11 is a right side view of a portable cutter according to a second embodiment. The figure shows the hook in a retracted position.

Fig. 12 is a front view of the portable cutter according to the second embodiment, as seen from the direction indicated by the arrow (XII) in fig. 11.

Fig. 13 is a top view of the portable cutter according to the second embodiment, as seen from the direction indicated by the arrow (XIII) in fig. 11.

Fig. 14 is a left side view of the portable cutter according to the second embodiment, as viewed from the direction indicated by the arrow (XIV) of fig. 12.

Fig. 15 is a top view of a portable cutter according to a second embodiment. The figure shows the hook in a forward use position.

Fig. 16 is a front view of a portable cutter according to a second embodiment. The figure shows the hook in a forward use position.

Fig. 17 is a top view of a portable cutter according to a second embodiment. The figure shows the hook in a side use position.

Fig. 18 is a front view of a portable cutter according to a second embodiment. The figure shows the hook in a side use position.

Fig. 19 is a rear view of the suspension portion according to the second embodiment, as seen from the direction indicated by the arrow (XIX) of fig. 11.

Fig. 20 is a cross-sectional view of the suspension according to the second embodiment taken along the line (XX) - (XX) in fig. 19. The figure shows a normal state in which the connection is not damaged.

Fig. 21 is a perspective view of a suspension portion according to a second embodiment. The figure shows a normal state in which the connection is not damaged.

Fig. 22 is a vertical cross-sectional view of a suspension according to a second embodiment. The figure shows a state in which the connection portion is damaged and the notification member is moved.

Fig. 23 is a perspective view of a suspension portion according to the second embodiment. The figure shows a state in which the connection portion is damaged and the notification member has been moved.

Fig. 24 is a perspective view of a notification member according to the present invention placed at the hanging portion of the second embodiment.

Fig. 25 is a right side view of a portable cutter according to a third embodiment. The figure shows the hook being removed to the forward position.

Fig. 26 is a front view of the portable cutter according to the third embodiment, as seen from the direction indicated by the arrow (XXVI) of fig. 25.

Fig. 27 is a right side view of a portable cutter according to a third embodiment. The figure shows the hook retracted to the retracted position.

Fig. 28 is a front view of the portable cutter according to the third embodiment, as seen from the direction indicated by the arrow (XXVIII) of fig. 27.

Detailed Description

Hereinafter, various embodiments of the present invention will be described with reference to fig. 1 to 28. Fig. 1 to 10 show a portable cutter 1 according to a first embodiment of the present invention. The portable cutter 1 according to the first embodiment is a hand-held cutter called a tip saw cutter, and may include a base 10 configured to be in contact with a cutting material W and a cutter body 20 supported on an upper side of the base 10. The base 10 is constructed in a rectangular flat plate and contacts the upper surface of the cut material W.

As shown in fig. 1 to 4, the cutter body 20 may include a motor 21 as a driving source, a circular rotary cutting tool 22, and an annular handle portion 23. A sharp saw blade is used as the rotary cutting tool 22 when cutting steel. Substantially the entire upper half circumferential portion of the rotary cutting tool 22 (upper side range of the base 10) is covered with the dust-proof fixing cover 24. The retaining cap 24 may be removed from the periphery of the rotary cutting tool 22 by loosening the retaining screw 24 a. An arrow 24b indicating the rotational direction of the rotary cutting tool 22 is shown on the right side of the stationary cover 24. The cover portion 24c is provided on the rear of the stationary cover 24 and is configured to discharge the collected cutting chips.

As shown in fig. 8, the motor 21 is coupled to the left side of the stationary cover 24 via a reduction gear portion 25. The support arm portion 25b is integrally formed with a front portion of a substantially cylindrical gear housing 25a of the reduction gear portion 25. The support arm portion 25b extends forward. The front portion of the support arm portion 25b is coupled to the upper surface of the base 10 via a vertical swing support shaft 26 a. The cutter body 20 is supported by the upper surface of the front portion of the base 10 so as to be vertically swingable via a vertical swing support shaft 26 a. The support arm portion 25b and the vertical swing support shaft 26a constitute a vertical swing support portion 26, and the vertical swing support portion 26 is configured to support the cutter body 20 so as to be vertically swingable with respect to the base 10.

The lower portion of the rotary cutting tool 22 protrudes to the underside through the window portion of the base 10. The periphery of the lower portion of the rotary cutting tool 22 protruding to the underside of the base 10 is covered with a movable cover 12. The movable housing 12 is configured to be opened and closed along the periphery of the rotary cutting tool 22. As shown in the figure, when the portable cutter 1 is moved in the cutting advancing direction, the movable cover 12 will be relatively opened as the front end thereof is brought into contact with the cutting material W.

The portion of the rotary cutting tool 22 protruding to the underside of the base 10 cuts into the cut material W to perform the cutting process. The protruding portion of the rotary cutting tool 22 protrudes from the underside of the base 10 by an amount corresponding to the depth of cut of the rotary cutting tool 22 into the cut material W. The cutting depth of the rotary cutting tool 22 into the cut material W can be adjusted by vertically swinging the cutter body 20 about the vertical swing support shaft 26 a.

As shown in fig. 3 and 8, the rear of the stationary cover 24 is coupled to the upper side of the rear of the base 10 via a depth guide 27. The set screw shaft 29 coupled to the left side of the set cover 24 is inserted into the guide groove of the depth guide 27. The fixing nut 29a is loosened from the fixing screw shaft 29 by a loosening operation of the fixing lever 28. This allows the cutting depth to be adjusted by vertically swinging the cutter body 20 about the vertical swing support shaft 26 a.

The annular handle portion 23 is provided atop the reduction gear portion 25. A trigger switch lever 38 is provided on the inner peripheral side of the grip portion 23. When the switch lever 38 is pulled upward with the finger tip, the main switch 39 is turned on. When the main switch 39 is turned on, the motor 21 is started. When the pulling-up operation of the switch lever 38 is released, the main switch 39 is turned off, so that the motor is stopped.

The front 23a of the handle portion 23 is coupled to an upper portion of the gear housing 25a. The front 23a of the handle portion 23 rises upward from the upper portion of the gear housing 25a. The grip portion 23b extends obliquely rearward and downward from an upper portion of the front portion 23 a. The rear of the grip portion 23b is coupled to the rear side of the gear housing 25a via the battery mounting portion 30. A single battery pack 31 is mounted on the lower side of the battery mounting portion 30. The motor 21 serving as a driving source operates using this battery pack 31 as a power source. The battery pack 31 can be removed from the battery mounting portion 30 and charged for reuse. As indicated by the blank arrow in fig. 3, the battery pack 31 is mounted to the battery mounting portion 30 when slidably moved to the right, and the battery pack 31 is removed when slidably moved to the left.

The illuminator 11 is provided in front of the reduction gear portion 25 and in a lower portion of the front portion 23a of the handle portion 23. The illuminator 11 brightly illuminates the cutting portion (the cut-in portion of the rotary cutting tool 22 to the cut material W) so that the cutting operation, for example, the cutting operation in a dark place is facilitated.

As shown in fig. 7 and 8, the motor housing 21a for the motor 21 is screwed to the gear housing 25a of the reduction gear portion 25. A brushless motor is used for the motor 21. The annular stator 21b is fixed along the inner peripheral side of the motor housing 21a, and the rotor 21c is rotatably supported on the inner peripheral side of the stator 21 b. The cooling fan 21e is attached to a motor shaft 21d, and the motor shaft 21d is coupled to the rotor 21c. As the cooling fan 21e is rotated by the motor 21, ambient air is introduced through a suction port 21f formed in the rear of the motor housing 21 a. The ambient air introduced through the suction port 21f flows to the right in the motor housing 21a to cool the stator 21b, the rotor 21c, and the like. The right end of the motor shaft 21d is meshed with the gear train of the reduction gear portion 25.

As shown in fig. 7, the rotational output of the motor 21 is transmitted to the output shaft 32 via a two-stage reduction gear train. The output shaft 32 enters the inside of the stationary housing 24. The rotary cutting tool 22 is attached to the right end of the output shaft 32 within the stationary housing 24. The rotary cutting tool 22 is sandwiched between two

attachment flanges

33, 34. In this clamped state, the rotary cutting tool 22 is attached to the left end of the output shaft 32 by tightening the cutting tool fixing screw 13.

As shown in fig. 8, a controller housing portion 35 is provided on the rear side of the motor 21 and between the motor 21 and the battery mounting portion 30. A controller 36 mainly for controlling the operation of the motor 21 is accommodated in the controller accommodating portion 35. The controller 36 may be formed by accommodating the control board in a rectangular shallow box and filling the shallow box with resin. As indicated by the broken lines of fig. 4 to 6, the controller 36 is accommodated in a posture such that its front side is inclined upward. The air for cooling the motor is introduced into the motor housing 21a by the cooling fan 21e of the motor 21 into the controller accommodating portion 35 to cool the controller 36.

The portable cutter 1 according to the first embodiment is provided with a connecting portion 40, the connecting portion 40 being for connecting a suspension member 41 such as a tether strap or the like, the suspension member 41 being for suspending the portable cutter 1 to, for example, a scaffold or an armrest or the like in a work place. The portable cutter 1 may also have a hanger 50, the hanger 50 being configured to be hooked directly to a scaffold or armrest or the like in the work place. The connection portion 40 is disposed near the connection portion of the grip portion 23b and near the battery mounting portion 30, at the rear of the handle portion 23. Fig. 9 and 10 show details of the connection portion 40 according to the first embodiment. The connection portion 40 has a substantially triangular connection hole 42. The connection hole 42 passes through the rear of the grip portion 23b in the left-right direction.

As shown in fig. 2, 3, 9 and 10, the handle portion 23 has a structure in which the left handle housing 23L and the right handle housing 23R in the left/right half structure abut against and are connected to each other. The left and right handle

cases

23L and 23R are connected to each other by a total of four screw fastening portions 37. In the figure, the abutting portions of the left and right handle

cases

23L and 23R are denoted by reference symbol J. The left handle housing 23L is not shown in fig. 9 and 10. The connection hole 42 extends through the left and right handle

cases

23L, 23R.

As shown in fig. 9, the wall portion 42a is provided around the connection hole 42. The inner peripheral side of the wall portion 42a defines the connection hole 42. One screw tightening portion 37 is adjacently arranged to the connection hole 42. The notification piece 43 is attached so as to extend around both the wall portion 42a of the connection hole 42 and the boss portion of the screw fastening portion 37. In the present embodiment, an annular metal ring is used for the notification piece 43. The notification piece 43 is configured such that the wall portion 42a of the connection hole 42 and the boss portion of the screw fastening portion 37 are located on the inner peripheral side of the notification piece 43. The notification member 43 is incorporated into the handle portion 23 during the assembly step of the portable cutter 1.

As shown in fig. 9, a hanging piece 41 such as a strap or the like is inserted into the connection hole 42 and wound around the end 23c of the handle portion 23 so as to be connected to the connection portion 40. The hanging piece 41 is thus inserted into the connection hole 42 and connected to the connection portion 40, while also being inserted into the inner peripheral side of the notification piece 43.

As shown in fig. 10, according to the connection portion 40, when the end 23c is broken due to damage caused by external force applied to the end 23c of the handle portion 23 due to long-term use or the like of the suspension 41, the inserted state of the suspension 41 in the connection hole 42 is released. However, as described above, the hanging piece is also inserted into the inner peripheral side of the notification piece 43. As a result, even if the hanging piece 41 comes out of the connection hole 42 when the end 23c of the handle portion 23 is broken, the hanging piece 41 can be kept inserted into the inner peripheral side of the notification piece 43. Alternatively, since the boss portion of the screw fastening portion 37 is located on the inner peripheral side of the notification piece 43, the notification piece 43 may be held in the hooked state. Thus, the suspension member 41 can remain connected to the handle portion 23 via the notification member 43. As a result, the suspending function of the suspension 41 can be maintained.

Further, as shown in fig. 10, when the end 23c of the handle portion 23 is broken and thus separated, the hanger 41 comes out of the connection hole 42. As a result, the notification member 43 is pulled out of the interior of the handle portion 23. Since the notification piece 43 previously incorporated inside the connection portion 40 is pulled to the outside, the user or the like can visually easily observe the pulled notification piece 43. Since the user or the like visually observes the pulled-out notification piece 43, the user or the like can confirm the deformation or damage of the inside of the connection portion 40 or the like due to the external force. As described above, the notification member 43 has a function of reliably notifying a user or the like of deformation or damage of the connection portion 40 of the suspension member 41 or the like.

As shown in fig. 1 to 4, the portable cutter 1 according to the present embodiment includes a hanging hook 50 in addition to the connecting portion 40 for connecting the hanging piece 41 described above. The hanging hook 50 is provided at the front of the cutter body 20 and the front of the fixed cover 24. In the first embodiment, the suspension hook 50 is provided on the upper side of the support arm portion 25b, and the support arm portion 25b swingably supports the cutter body 20 to the base 10. The suspension hook 50 includes a hook rod 51 formed by bending a steel bar into a U shape and a hook supporting portion 52 configured to support the hook rod 51 on an upper side of the supporting arm portion 25 b.

The hook lever 51 includes a lower lateral portion 51a extending in the left-right direction, a vertical portion 51b extending upward from the right end of the lower lateral portion 51a, and an upper lateral portion 51c extending leftward from the upper portion of the vertical portion 51 b. The lower lateral portion 51a extends rightward from the hook supporting portion 52. The vertical portion 51b extends in a substantially vertical direction from the right end of the lower lateral portion 51 a. The upper lateral portion 51c extends leftward from an upper portion of the vertical portion 51 b. The upper lateral portion 51c extends in a slightly acute angle from the upper portion of the vertical portion 51 b. The alignment protrusion 51d is provided on the lower lateral portion 51 a. A hook projection 51e is provided on the tip of the upper lateral portion 51c, and is configured to be engaged with an object to be hooked, such as a scaffold.

As shown in fig. 3, the hook support portion 52 is screwed to the upper side of the support arm portion 25b by two attachment screws 52 a. The hook support portion 52 includes a cylindrical support tube portion 52b. The lower transverse portion 51a is rotatably and axially movably inserted into this support tube portion 52b. As a result, the hook lever 51 is supported so as to be capable of swinging in an upward and downward direction and displacing in a leftward and rightward direction about a lower lateral portion 51a (e.g., about a left-right lateral axis) parallel to the rotation axis of the rotary cutting tool 22. As shown in fig. 5, two V-shaped

engaging grooves

52c, 52d are provided at the left end of the support pipe portion 52b. The two

engaging grooves

52c, 52d are arranged in a radial direction passing through the center of the support pipe portion 52b. The two

engaging grooves

52c, 52d are arranged at a constant angle (about 120 degrees in the present embodiment) with respect to each other.

The left end of the lower lateral portion 51a of the hooking rod 51 protrudes from the left end of the supporting tube portion 52b. The engagement pin 51f is provided at this protruding portion. The engagement pins 51f protrude from both sides of the lower lateral portion 51a in the radial direction. Although not visible in the drawings, the compression spring is sandwiched between the inner peripheral side of the support tube portion 52b and the lower lateral portion 51 a. The lower lateral portion 51a is biased by this compression spring so as to be oriented rightward in the axial direction. With this biasing force, the engagement pin 51f is held in a state in which the engagement pin 51f is fitted into the engagement groove 52c or the engagement groove 52d, thereby preventing the rotation of the lower lateral portion 51 a. By restricting the rotation of the lower lateral portion 51a, the hook lever 51 can be held in the retracted position, the upper lateral portion 51c placed upward, or held in the use position, the upper lateral portion 51c placed downward (forward). Fig. 1 to 4 show the hook rod 51 retracted in the retracted position. Fig. 5 shows the hook rod 51 removed to the use position.

As shown in fig. 1 to 4, when the hook lever 51 is retracted in the retracted position, the vertical portion 51b thereof is located in a position where the vertical portion 51b is inclined obliquely upward and rearward from the vicinity of the front end of the base 10. In contrast, when the hooking rod 51 is taken out and put in the use position, the hooking rod 51 protrudes greatly forward from the vicinity of the front end so as to be substantially horizontal. Since the upper lateral portion 51c of the hooking rod 51 is taken out forward to a place greatly distant from the front end of the base 10, the hooking rod 51 can be hooked to a scaffold or a handrail more easily. In this regard, the usability of the hanger hook 50 can be enhanced. As shown in fig. 5, the use position of the hooking rod 51 is limited to a position where the hooking rod 51 does not protrude below the lower side of the base 10, but is placed above the base 10. This prevents the hook rod 51 from interfering with the cutting material W or the rotary cutting tool 22 even when the hook rod 51 is unintentionally moved to the use position during the cutting operation.

In fig. 11 to 18, a portable cutter 60 according to a second embodiment is shown. Components or structures similar to those of the portable cutter according to the first embodiment will be denoted by the same reference numerals and will not be described again. The portable cutter 60 according to the second embodiment is a portable cutter configured to perform a cutting process mainly on wood or the like, and is also referred to as a portable circular saw. The portable cutter 60 according to the second embodiment is different from the portable cutter 1 according to the first embodiment in that a circular saw blade is used as the rotary cutting tool 61. Further, the stationary cover 62 is provided along the upper peripheral edge of the rotary cutting tool 61 and the center of the rotary cutting tool 61 is exposed at the side, thereby achieving greater convenience when changing the cutting tool, for example. In contrast, the portable cutter 1 according to the first embodiment covers substantially all of the rotary cutting tools 22 on the upper side of the base 10, thereby enhancing dust collection performance. In the first embodiment, the stationary cover 24 is made movable, thereby achieving greater convenience when changing cutting tools, for example.

Similarly, according to the portable cutter 60 of the second embodiment, the cutter body 20 is supported by the base 10 so as to be vertically swingable about the vertical swing support shaft 63a of the vertical swing support portion 63. The portable cutter 60 of the second embodiment also includes a cutting depth adjustment mechanism to adjust the rotary cutting tool 61 with respect to the workpiece W, similarly to the portable cutter 1 according to the first embodiment. According to the portable cutter 60 of the second embodiment, the cutter body 20 is supported so as to be able to swing leftward and rightward via the front support 64 at the front side and the rear support 65 at the rear side of the base 10. The cutter body 20 can perform so-called bevel cutting by tilting to the left or right. The portable cutter 60 according to the second embodiment is different from the portable cutter 1 according to the first embodiment in that the portable cutter 60 has a bevel cutting function.

In the portable cutter 60 according to the second embodiment, the front grip portion 68 is provided at the front of the handle portion 23. The user occupies a position behind the portable cutter 60 and holds the handle portion 23 with his/her right hand and the front grip portion 68 with his/her left hand so that the portable cutter 60 can be operated to move in a stable manner. In this regard, the operability of the portable cutter 60 is enhanced.

As shown in fig. 14, according to the portable cutter 60 of the second embodiment, a controller 66 for controlling the operation of the motor 21 is enclosed in a controller housing 67 provided in front of the motor 21. Unlike the first embodiment, the battery mounting portion 30 can be arranged closer to the motor 21 by arranging the controller housing 67 in front of the motor 21. Thereby, the cutter body 20 can be made more compact in the forward/backward direction. Accordingly, as shown in fig. 11, 13 and 14, according to the portable cutter 60 of the second embodiment, the cutter body 20 is configured not to protrude from the rear end of the base 10. This enhances the handling of the portable cutter 60 during the cutting operation and ensures compactness upon retraction.

The portable cutter 60 according to the second embodiment includes a connection portion 70 and a hanger 80, and the connection portion 70 and the hanger 80 are configured differently from the connection portion 40 and the hanger 50 according to the first embodiment. The connection portion 70 is a portion to which a suspension 71 such as a so-called tether strap is connected. Similar to the first embodiment, it is provided on the rear side of the handle portion 23. Details of the connection 70 according to the second embodiment are shown in fig. 19 to 24.

The connection portion 70 according to the second embodiment includes a connection hole 72. The connection hole 72 forms a U-shaped path along the periphery of the screw tightening portion 37. The screw fastening portion 37 is configured to connect the left handle case 23L and the right handle case 23R in the left and right half structures of the handle portion 23 so as to abut against each other. Accordingly,

openings

72a, 72b of the connection hole 72 are formed at both upper and lower sides of the screw fastening portion 37. The connection hole 72 is divided from the inside of the handle portion 23 by a wall portion 72c provided along the periphery of the screw tightening portion 37. The connection hole 72 is provided along a U-shaped path formed between the wall portion 72c and the screw tightening portion 37.

The notification member 73 is incorporated inside the connection hole 72. Fig. 24 shows only the notification member 73. The notification member 73 according to the second embodiment is formed by bending a steel bar. The notification piece 73 according to the second embodiment includes a hook portion 73a bent into a U shape, an engagement portion 73b formed by bending one end of the hook portion 73a to the left in an L shape, and a leg portion 73c formed similarly in an L shape by bending the other end of the hook portion 73a to the front. A support portion 73d curved in a circular shape is formed at the front portion of the leg portion 73c. As shown in fig. 20 to 23, the notification member 73 is incorporated such that the hook portion 73a is placed substantially inside the connection hole 72 below the screw fastening portion 37.

The engaging portion 73b, the leg portion 73c, and the support portion 73d of the notification piece 73 are located outside from the wall portion 72c through the cutout 72d formed in the wall portion 72c of the connection hole 72. As shown in the drawing, the support portion 73d of the right leg portion 73c is hooked and connected to the engagement portion 74 provided at the right handle housing 23R. Although not shown in the drawings, the left engaging portion 73b is inserted into an engaging hole formed in the inner surface of the left handle case 23L. In this way, the left engaging portion 73b and the right leg portion 73c are connected to the left and right handle

cases

23L, 23R such that the hook portion 73a is provided in the area of the opening of the cutout 72d so as to be swingable in the upward/downward direction.

As shown in fig. 20 and 21, the suspension 71 is inserted through the inside of the hook 73a of the notification member 73 and connected by winding the screw fastening portion 37. As shown in fig. 22 and 23, according to the connecting portion 70 constructed as above, even if the screw fastening portion 37 is lost due to damage caused by external force applied to the screw fastening portion 37 after long-term use or the like of the hanger 71, for example, the hanger 71 can remain hooked to the hook portion 73a of the notification member 73. The notification member 73 may remain connected to the handle portion 23 via the engagement portion 73b and the leg portion 73c. Accordingly, the suspension 71 can remain connected to the handle portion 23 via the notification member 73, and as a result, the suspension function of the suspension 71 can be maintained.

Further, when the screw fastening portion 37 is broken and separated from the connection portion 70, and as a result, when the suspension 71 comes out of the connection hole 72, the notification piece 73 is pulled out from the lower opening 72b of the connection hole 72. Since the notification piece 43 previously located inside the connection portion 70 is now pulled to the outside, the user or the like can visually easily observe the pulled notification piece 43. The user or the like can confirm the deformation or damage of the inside of the connection portion 70 due to the external force or the like. This can be accomplished by a user or the like visually observing that the notification member 43 has been pulled to the outside of the connection portion 70. As described above, the notification member 73 has a function of reliably notifying a user or the like that the connection portion 70 of the suspension 71 has been deformed or damaged or the like. With the notification function of the notification member 73, it is possible to notify the user of the portable cutter 60 similarly to the first embodiment.

As shown in fig. 11 to 14, a suspension hook 80 according to the second embodiment is supported at the front of the stationary cover 62. The suspension hook 80 includes a hook bar 81 formed by bending a steel bar into a U shape. The suspension hook 80 also includes a hook support portion 82 configured to support the hook bar 81 at the front of the stationary housing 62. The hook lever 81 includes a vertical portion 81a extending upward from the hook supporting portion 82, a lateral portion 81b extending in a substantially vertical direction from an upper portion of the vertical portion 81a, and a hook portion 81c extending downward from a front end of the lateral portion 81b at an acute angle. The hook protrusion 81d is provided on the tip of the hook portion 81c, and can engage with an object to be hooked, such as a scaffold. As shown in fig. 11, the vertical portion 81a is inclined in an obliquely rearward direction so that the upper portion is further displaced in the rearward direction.

The hook support portion 82 is screwed to the front of the stationary cover 62 with two attachment screws 82 a. The cylindrical support tube portion 82b is provided to the hook support portion 82. A lower portion of the vertical portion 81a is rotatably and axially movably inserted into this support tube portion 82b. As a result, the hook lever 81 is supported so as to be swingable in the left/right direction and displaceable in the upward/downward direction around the vertical portion 81 a.

The lower end of the vertical portion 81a of the hooking rod 81 protrudes from the lower end of the support pipe portion 82b. Engagement pins 81e protruding from both radial sides are provided on protruding portions of the vertical portion 81 a. Two V-shaped engagement grooves extending through the center of the tube portion 82b are provided at the lower end of the support tube portion 82b. Similar to the first embodiment, when the engagement pin 81e is fitted into any one of the plurality of engagement grooves, the rotational movement of the vertical portion 81a is restricted, thereby locking the position of the hook lever 81. In the second embodiment, the hook bar 81 can be held in four positions around the vertical bar 81 a. Similar to the first embodiment, the vertical portion 81a of the hook lever 81 is biased in the upward direction by a compression spring sandwiched between the vertical portion 81a and the support pipe portion 82b. The engagement pin 81e is held in a state of being fitted in the engagement groove by the biasing force of the compression spring, so that the position of the hook lever 81 around the vertical portion 81a can be maintained.

Fig. 11 to 14 show a state in which the hook 81c is held in the retracted position, in which the hook 81c is located in front of the handle portion 23 (e.g., toward the left side of the stationary cover 62). Fig. 15 and 16 show a state in which the hook portion 81c is held at the front use position, in which the hook portion 81c is located in front of the fixed cover 62. Fig. 17 and 18 show a state in which the hook portion 81c is held at the side-use position, in which the hook portion 81c is located on the right side of the fixed cover 62. With the engagement pins 81e elastically fitted into the respective engagement grooves, the hook levers 81 can be held in each of these positions. Incidentally, although not shown, the hook lever 81 may be held at a retracted position where the hook portion 81c is placed above the stationary cover 62, such as by rotating the hook lever 81 180 degrees from the front use position. As shown above, the hook lever 81 may be held in any one of four positions in total, in which the hook portion 81c is placed in front of, above, left or right of the stationary cover 62 as the engagement pin 81e is elastically fitted into the engagement groove.

According to the hanging hook 80 of the second embodiment, it is possible to ensure compactness of the portable cutter 60 by holding the hook lever 81 in the retracted position, thereby preventing interference when not in use. On the other hand, the portable cutter 60 is suspended in various postures by selectively holding the hook bar 81 at the front use position or at the side use position according to the situation of the work site. Thus, the function of the suspension hook 80 can be enhanced.

The structure of the hanger 50 of the first embodiment and the hanger 80 of the second embodiment is shown such that the engagement pins are elastically fitted into the engagement grooves so as to maintain various positions of the

hook rods

51, 81. However, it may also be possible, for example, to construct the structure such that the position of the

hook rods

51, 81 is locked by tightening the set screws.

In fig. 25 to 28, a portable cutter 90 according to a third embodiment is shown. The portable cutter 90 according to the third embodiment is different from the portable cutter 60 according to the second embodiment in that a hanging hook 91 is provided, the hanging hook 91 being different from the hanging hook 80 according to the second embodiment. The components and structures other than the hanging hook 91 are substantially the same as those of the portable cutter 60 of the second embodiment. Therefore, they use the same reference numerals and will not be described again. Similar to the second embodiment, a connection portion 70 for connecting a hanging piece 71 such as a tether strap is provided at the rear of the handle portion 23 of the portable cutter 90 of the third embodiment.

Similar to the second embodiment, the suspension hook 91 according to the third embodiment is supported at the front of the stationary cover 62. The suspension hook 91 includes a hook bar 92 formed by bending a steel bar in a U shape and a hook supporting portion 93 configured to support the hook bar 92 at the front of the fixed cover 62. The hook lever 92 includes a vertical portion 92a extending upward from the hook supporting portion 93, a lateral portion 92b extending in a substantially vertical direction from an upper portion of the vertical portion 92a, and a hook portion 92c extending downward from a tip end of the lateral portion 92b at an acute angle. A hook projection 92d is provided on the tip of the hook portion 92c, and is configured to be engaged with an object to be hooked, such as a scaffold. As shown in fig. 25, the vertical portion 92a is inclined in an obliquely rearward direction so that the upper portion is further displaced in the rearward direction. In this regard, the construction thereof is similar to the suspension hook 80 according to the second embodiment.

A support shaft portion 92e having a narrower diameter is coaxially provided at the vertical portion 92a of the hook lever 92. The support shaft portion 92e extends further downward from the lower end of the vertical portion 92 a. A lower portion of the support shaft portion 92e protrudes from a lower end of the support tube portion 93 a. The engagement pins 95 are arranged in a protruding manner on both radial sides of this protruding portion.

The hook support portion 93 includes a cylindrical support tube portion 93a and an attachment portion 93f attached to the stationary cover 62. The attachment portion 93f is connected with two attachment screws 94 such that the hook support portion 93 is attached to the front of the stationary cover 62. The support tube portion 93a according to the third embodiment has a cylindrical shape longer than the support tube portion 82b according to the second embodiment. Two insertion holes having different diameters are coaxially provided on the inner peripheral side of the support tube portion 93 a. The upper insertion hole 93b is configured to have a larger diameter than the lower insertion hole 93 c. The upper insertion hole 93b is formed to have a diameter capable of inserting the vertical portion 92a of the hook lever 92. The lower insertion hole 93c is formed to have a diameter that enables insertion of the support shaft portion 92e of the hook lever 92 but disables insertion of the vertical portion 92a having a larger diameter.

The compression spring 96 is sandwiched between the lower surface of the vertical portion 92a and the bottom of the insertion hole 93 b. The compression spring 96 is also disposed around the support shaft portion 92e of the hook lever 92. Due to the biasing force of the compression spring 96, the vertical portion 92a is biased upward in the pull-out direction from the insertion hole 93b of the support pipe portion 93 a. This causes the hook lever 92 to be biased toward an upper position that displaces the hook lever 92 upward. Fig. 25 and 26 show a state in which the hook lever 92 is located at the upper position.

Two

engagement grooves

93d, 93e having different depths in the longitudinal direction are formed in the lower surface of the support pipe portion 93 a. The engaging groove 93d is formed deeper and the engaging groove 93e is formed shallower. Each of the deeper engaging groove 93d and the shallower engaging groove 93e is formed in a radial direction passing through the center of the lower surface of the support pipe portion 93 a. Each of the deeper engaging groove 93d and the shallower engaging groove 93e is arranged so as to intersect with each other in a cross shape (as seen from the direction indicated by the XXVI arrow in fig. 25) in the bottom view of the support pipe portion 93 a.

As shown in fig. 25, when the hook lever 92 rotates about the vertical portion 92a such that the engagement pin 95 is placed in the deeper engagement groove 93d by the biasing force of the compression spring 96, the engagement pin 95 is held in an upper position that abuts the engagement pin 95 against the bottom of the engagement groove 93 d. With the hook lever 92 in the upper position, the lateral portion 92b will be in a state where the lateral portion 92b extends obliquely upward and forward from the upper portion of the vertical portion 92a (for example, in the upper use position), or will be in a state where the lateral portion 92b extends obliquely downward and rearward (for example, in the upper retracted position). In the upper use position in which the lateral portion 92b extends obliquely upward and forward, the hook portion 92c is in a state in which the hook portion 92c is placed over the front portion of the base 10. The upper use position of the hooking rod 92 corresponds to the use position, which is an advantageous position when the hooking rod 92 is to be hooked to a separate component, such as a scaffold or the like. The lateral portion 92b and the hook portion 92c can be placed in an upper retracted position above the stationary cover 62, which is rotated 180 degrees from this upper use position.

The hook lever 92 can be pushed down from the upper position to release the engagement pin 95 from the deeper engagement groove 93 d. Thereafter, the hook lever 92 is rotated about the vertical portion 92a by about 90 degrees, and then the pushing-down operation is stopped. Thereby, the hook lever 92 returns upward so that the engagement pin 95 is fitted into the shallower engagement groove 93 e. This state is shown in fig. 27 and 28. When the engagement pin 95 is placed and fitted in the shallower engagement groove 93e, the hook lever 92 as a whole is held at a position lower than the use position. This lower position corresponds to the retracted position of the hook lever 92. As shown, when the hook lever 92 is retracted in the retracted position, the lateral portion 92b thereof extends from the upper portion and to the left of the vertical portion 92 a. As a result, the hook 92c is placed in front of the handle portion 23. Thus, when the hook lever 92 is retracted to the retracted position, this will be in a position lower and further rearward than the use position. Thus enabling compactness of the portable cutter 90. Because the cutting operation can be performed while the hook rod 92 is compactly retracted, the operability of the portable cutter 90 can be enhanced. Further, by holding the hook lever 92 in a position rotated 180 degrees from the retracted position shown in fig. 27 and 28, the lateral portion 92b can be brought into a state in which the lateral portion 92b extends rightward and is placed to the right side of the fixed cover 62. Thus, the portable cutter 90 can be suspended by hooking the hooking rod 92 to a separate component in this position.

The above-described portable cutter 1 according to the first embodiment, the connecting portion 40 for connecting the hanging piece 41 such as a so-called tether strap or the like is provided at the rear of the handle portion 23. Therefore, for example, when a user performs a cutting operation while one end of the hanger 41 is connected to the connecting portion 40 and the other end is hooked to, for example, a scaffold or a handrail, it is possible to prevent the portable cutter 1 from falling off during a work.

In the first embodiment, the connection portion 40 is configured to incorporate the notification piece 43. The notification member 43 is configured to notify the deformation of the connection portion 40 when the connection portion 40 is damaged, for example, due to an external force. This notification member 43 is used to notify a user or the like of an event that the connecting portion 40 has been deformed due to, for example, being damaged. The user or the like can visually observe the change in the position of the notification member 43 to confirm that the connection portion 40 is damaged, for example. The user can recognize that proper functionality of the suspension 41 may not be reliably performed if the suspension 41 is continuously used. Therefore, the user can repair damage to the connection portion 40, etc., and continuously use the hanger 41, thereby reliably performing the anti-drop function. Further, by suspending the use of the portable cutter 1 having the damaged hanging portion 40, it is possible to avoid a state where its original function cannot be sufficiently performed.

Further, with the portable cutter 1 according to the first embodiment, the attachment hole 42 for attaching the hanging piece 41 is provided at the rear of the handle 23. Thus, the operability of the portable cutter 1 can be maintained without occurrence of the suspension 41 interfering with the user's grip of the grip portion 23.

In addition, according to the portable cutter 1 of the first embodiment, the hanging piece 41 is wound around the end 23c of the handle portion 23 while the hanging piece 41 is inserted into both the connection hole 42 and the notification piece 43. Even if the end portion 23c breaks off when an external force such as an impact or the like is applied, the hanging function of the hanging piece 41 can be maintained while the hanging piece 41 is connected to the rear portion of the handle portion 23 via the notification piece 43.

Modifications may be further made to the various embodiments described above. For example, in the first embodiment, a structure in which the connection portion 40 for connecting the suspension 41 is provided at the rear of the handle portion 23 is shown. However, the same effect can be obtained by incorporating a similar notification member to be placed at the upper or front portion of the handle portion 23.

Further, a structure incorporating the notification piece 43 has been shown so as to lengthen the rib separating the connection hole 42 and the screw fastening portion 37. However, the structure may also be configured to incorporate a notification member to extend past the rib and the hooking protrusion provided as an alternative to the screw fastening portion 37.

Further, the suspension may be configured to be connected to components other than the handle portion 23. Even in this case, the same effect can be obtained by employing the illustrated connection portion.

Further, in the second embodiment, although the notification member 73 has been shown as being formed by bending a steel bar, alternatively, a ring-shaped wire may be incorporated in a similar manner to the first embodiment.

Further, the

notification pieces

43, 73 have been shown for notifying damage of displacement of the

connection portions

40, 70 from the incorporated positions. However, the notification means may be incorporated to notify the damage of the human connection by illumination or generation of sound.

Claims

1. A portable cutter configured to perform a cutting process by allowing a rotary cutting tool to cut into a cutting material, the rotary cutting tool being rotated by a motor as a driving source, the portable cutter comprising:

a connection portion for connecting a suspension portion configured to be suspended from the individual component; and

a notification member configured to provide notification when the connection portion is deformed by an external force,

wherein the notification member is further configured to visually notify the deformation of the connecting portion when being rotated or deformed around one end of the connecting portion so as to move the other end of the connecting portion from the inside to the outside of the main body of the portable cutter.

2. The portable cutter of claim 1, further comprising a handle portion extending in a forward/rearward direction along the rotary cutting tool, wherein the connection is disposed at a rear of the handle portion.

3. The portable cutter of claim 1, the connection and/or the notification member comprising a connection aperture, the suspension portion configured to be inserted into the connection aperture.

4. The portable cutter according to claim 3, wherein the hanging portion is configured to be inserted through an inner peripheral side of the notification member and the connection hole to be connected to the connection portion.

5. The portable cutter according to claim 3 or 4, comprising a loop wire serving as a notification member.

6. The portable cutter according to claim 3 or 4, comprising a U-shaped insertion hole formed along a periphery of the connection portion as the connection hole, and the hanging portion is configured to be inserted into the connection hole to be connected to the connection portion.

7. The portable cutting machine according to any one of claims 1 to 4, wherein a notification member is configured to provide notification of deformation of the connection portion when the notification member is pulled up and moved by the hanging portion if the connection portion is deformed by an external force.